Rotate an Image by Any Angle — Free & Private

Rotating a JPEG is not lossless in a browser

There is a real distinction here that no other free rotator seems to mention, and it decides how much quality you lose.

A JPEG is stored as a grid of 8×8 blocks, each compressed on its own. Turning the whole picture by a multiple of 90° can in principle be done by rearranging those blocks without decoding them — nothing is re-compressed, so nothing is lost at all. That is what jpegtran does on a desktop, and what the Photos app on your phone does when you tap rotate.

A browser cannot do it. Once an image is drawn onto a canvas it has been decoded to pixels, and writing it back out means compressing it again. So a JPEG rotated here goes through one extra encode at high quality. On a photograph that is invisible — it is a far smaller change than the camera made when it saved the file — but it is not nothing, and a page that says "no quality loss" about a JPEG is not telling you the truth.

Two ways to avoid it entirely, if the picture matters that much:

• Set the output to PNG or WebP. Both are lossless formats, so the pixels that come out are exactly the pixels that went in. The file will be larger — often several times larger for a photograph — because you are storing the JPEG’s own artefacts perfectly.
• Use the rotate button in your phone’s photo app or a desktop tool for a JPEG you want bit-for-bit intact. That is the one case where a browser is the wrong place.

Why photos come out sideways, and what rotating fixes

If a photograph looks sideways on one device and upright on another, the pixels are almost never the problem. Cameras and phones usually store the picture in the sensor’s own orientation and add an EXIF Orientation tag — a note saying "display this turned 90° clockwise". Software that reads the note shows it correctly; software that ignores it shows it on its side. The file is identical either way.

Rotating here fixes that permanently, because the canvas writes out the pixels as they are displayed and the tag is not carried over. The picture becomes upright in the bytes themselves, so every piece of software agrees about it. That is usually exactly what you want before uploading to a site or a printer that gets it wrong.

The same step also removes everything else in the metadata: camera model, timestamp, lens, and the GPS coordinates a phone attaches by default. Good before posting publicly, costly if you catalogue photographs by capture date. To strip metadata without re-encoding the picture at all, use Metadata Remover.

Rotate by any angle, and straighten a tilted photo

Type any angle from −180° to +180° in the Custom angle box — 5°, 10°, 3.5°, −12° — or drag the fine slider, which moves ±10° either side of the current quarter turn, so a photo that needs 90° and then a slight tilt is two quick moves. Positive angles turn clockwise. The preview and the output size update as you go, and the file you download is rendered from the full-size original, never from the preview. It works the same for JPG, PNG and WebP.

A quarter turn and a custom angle are different operations. 90°, 180° and 270° map every pixel onto another pixel exactly, so the result is the same picture rearranged and as sharp as the original. Any other angle means each output pixel is a blend of several input pixels, so the picture softens very slightly. It also no longer fits its own frame, and you have to decide what happens to the corners:

• Auto crop (the default) keeps the largest rectangle of the picture’s own shape that has no empty corner in it. This is what you want for a crooked horizon.
• Crop manually puts a box over the whole turned picture. It starts at the auto-crop rectangle; drag it, drag a corner to resize it, or move it with the arrow keys (Shift for bigger steps). Any empty corner you include takes the background you choose.
• Keep full image keeps every pixel and makes the image bigger to hold the turned picture. The corners are transparent, white, black or a colour you choose. A JPEG cannot store transparency, so transparent corners come out white unless you save as PNG or WebP.

Auto crop always costs more of the picture than people expect, and the cost depends on the shape. These are the shares of the picture it keeps, from the same formula the tool uses:

So a 2° correction on a 16:9 photo loses over a tenth of it, mostly from the edges. The wider the picture, the more it loses. If something important sits near an edge, choose Crop manually and keep it inside the box, or Keep full image to lose nothing at all.

Straightening a tilted photo

Drag the fine slider until the horizon, a wall or a door frame runs along one of the grid lines over the preview, and keep Auto crop selected. A horizon that drops to the right needs a negative angle. Most handheld tilts are under 3°, so a slight rotation is usually all it takes.

Rotating many images at once

Drop a whole set of photos in. Each gets a tile with ⟲ and ⟳ buttons, so a folder where some pictures are on their side and others upside down is fixed tile by tile, without opening each one. Click a tile to set a custom angle, a flip or the corners for that image alone, or use Apply these settings to all when every picture needs the same correction. The button then rotates them all and hands you one ZIP. Each image is rendered from its original, one at a time, so a big batch does not need a big computer.

Capabilities at a glance

What this tool does and does not do, stated plainly. The “No” rows are the point, not an omission.